检索结果-南通市图书馆

A Comparison about Metamorphism among the Oldest-Rock Units from Orogenic Belts of Dabie,Eastern Qinling and Eastern Kunlun of Central Mountain Ranges,china

引用

Journal of earth Science 1998年第3期17卷 10-15页

作者： chen nengsong zhang kexin wang guocan hou guangjiu zhu yunhai faculty of earth sciences, china university of geosciences, Wuhan {2.

The Dabie orogen, Eastern Qinling orogen and Eastern Kunlun orogen are the major components of the Central Mountain Ranges of china and each has distinctively metamorphic processes in their oldest rock units. The Dabie orogen oldest rock units had experienced an intermediate-higher pressure, upper amphibolite to lower granulite facies metamorphism in the Indosinian intracontinental subduction collision event. The clockwise pt path, synchronous attainment of t max and p max and a segment of high slope retrograde path suggest a tectono driven rapid exhumation of the oldest rock units to upper middle crustal level following the end of the subduction collision process. The oldest rock units, also called Qinling Group, of Eastern Qinling Mountains suffered intensively collisional metamorphism at an immature plate tectonic framework during Jinningian movement about 1 000 Ma ago. The clockwise pt path with reach of t max following several hundreds of MPa decreasing from p max suggests that the denudation of the deeply burial rock units was due essentially to isostatic relaxation. During the Caledonian stage, the highly metamorphosed oldest rock units suffered from a high t thermal event in arc environment and superimposed by contact metamorphism. After thermal peaks, the rock units were exhumed in a short distance and cooled down isobarically. No regional metamorphism higher than upper greenschist facies condition since 300 Ma has been traced within exposed rocks in the eastern portion of Northern Qinling orogen. The oldest rock units in the Eastern Kunlun orogen were metamorphosed to upper amphibolite facies to lower granulite facies rocks early or during the Luliang movement (some 1 800 Ma ago). The high grade metamorphic rock units had a long resident time at the deep crustal level, and were exhumed to middle upper crustal level during the Caledonian to Hercynian tectonometamorphic events. Shallow erosion of

关键词： the oldest metamorphic rock units pt path geodynamics of metamorphism Dabie orogen Eastern Qinling orogen Eastern Kunlun orogen Central Mountain Ranges of china.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

东昆仑造山带前陆盆地的叠加褶皱及其变形机制

引用

地球科学（中国地质大学学报） 1999年第2期24卷 125-128页

作者：侯光久王国灿张克信陈能松朱云海拜永山中国地质大学地球科学学院青海省地勘局区调院

在东昆仑造山带的三叠纪洪水川群复理石岩系中，发育着两组斜歪－倒转褶皱：一组轴迹方向为北西向，与造山带主体构造线近一致；另一组为新发现的北东向，与造山带主体构造线近垂直，形成叠加褶皱．每一组褶皱均是压扁、纯剪切、纯剪切... 详细信息

在东昆仑造山带的三叠纪洪水川群复理石岩系中，发育着两组斜歪－倒转褶皱：一组轴迹方向为北西向，与造山带主体构造线近一致；另一组为新发现的北东向，与造山带主体构造线近垂直，形成叠加褶皱．每一组褶皱均是压扁、纯剪切、纯剪切＋简单剪切三种变形机制的产物．北西向褶皱轴面的南西倒和北东向褶皱轴面的北西倒，与国内外典型的前陆盆地中的褶皱形态不尽相同，反映了动力基础是板块碰撞之后的近于垂直的北东及北西方向挤压应力相继作用下形成的叠加褶皱．北东向褶皱的发现，揭示了造山带中构造应力场的转换．

关键词：叠加褶皱前陆盆地东昆仑造山带变形机制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

东昆仑造山带东段清水泉高级变质岩片的变质岩石学研究

引用

地球科学（中国地质大学学报） 1999年第2期24卷 116-120页

作者：陈能松朱杰王国灿侯光久张克信朱云海拜永山中国地质大学地球科学学院青海省地勘局区调院

清水泉高级变质岩片位于东昆仑造山带东段昆中多旋回俯冲碰撞构造混杂岩带内，由高角闪岩相—麻粒岩相变质的麻粒岩、斜长角闪岩、片麻岩、变粒岩和大理岩组成，地球化学特征显示为一套形成于后太古宙以来的火山－沉积岩系．顶峰期典型... 详细信息

清水泉高级变质岩片位于东昆仑造山带东段昆中多旋回俯冲碰撞构造混杂岩带内，由高角闪岩相—麻粒岩相变质的麻粒岩、斜长角闪岩、片麻岩、变粒岩和大理岩组成，地球化学特征显示为一套形成于后太古宙以来的火山－沉积岩系．顶峰期典型矿物共生组合为石榴石＋蓝晶石＋钾长石＋斜长石＋黑云母＋石英＋金红石和石榴石＋紫苏辉石＋斜长石＋石英，属中压相系，变质温度压力条件为（８５０±５０）℃和高于１．０ＧＰａ．石榴石中ｘ（Ｓｐｓ）成分剖面平坦，近边缘略为上升，ｘ（Ａｌｍ），ｘ（Ｐｙｒ）和ｘ（Ｇｒｓ）仍保留了较好的生长环带特点．ｐ－ｔ轨迹为顺时针型，记录了古－中元古代之交或晋宁运动期间强烈的碰撞构造事件．

关键词：高级变质岩片岩相学变质作用变质岩造山带

来源：

维普期刊数据库

同方期刊数据库评论